<template>
  <div class="login_container">
    <h2>login component</h2>
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt srcset />
      </div>

      <!-- 登录表单区域 -->
      <el-form class="login_form" ref="loginFormRef" :model="loginForm" :rules="loginFormRules">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            type="password"
            prefix-icon="iconfont icon-3702mima"
            v-model="loginForm.password"
          ></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="loginIn">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 3, max: 9, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    loginIn() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        //因为返回primise 所以用 await来简化 await和async必须成对出现  console.log(result)
        var { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')

        //保存token
        window.sessionStorage.setItem('token', res.data.token)
        this.$router.push('/home')

        //路由导航守卫控制访问权限，存在token才能访问登录之后的页面
      })
    }
  }
}
</script>
<style lang='scss' scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  .login_box {
    padding: 8px;
    width: 450px;
    height: 300px;
    background-color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    .login_form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }
    .avatar_box {
      position: absolute;
      left: 50%;
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 6px #ccc;
      background: white;
      transform: translate(-50%, -50%);
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
}
</style>